Re: [lwip-users] lwip on freertos

[Jesper Vestergaard]

Jesper Vestergaard wrote:
> Jesper Vestergaard wrote:
> > address@hidden wrote:
> > > > On Tue, 2009-06-09 at 17:12 +0200, Jesper Vestergaard wrote:
> > > >   
> > > > > I have found the problem. ip_output_if generates a header for the 
> > > > > packet
> > > > > but there's not enough room for it and  pbuf_header(p, IP_HLEN)) 
> > > > > fails.
> > > > > To be more precise it is the if ((u8_t *)p->payload < (u8_t *)p +
> > > > > SIZEOF_STRUCT_PBUF) check in pbuf_header which fails.
> > > > >
> > > > > What can i do to fix this problem?
> > > > >
> > > > >       
> > > > That is a very strange problem, the pbuf should have been allocated 
> > > > with
> > > > enough space to contain the IP header.
> > > >
> > > > Unfortunately, this code has changed a lot recently (since 1.3.0) so
> > > > it's hard to diagnose using the current CVS head, or even establish if
> > > > the problem still exists.
> > > >
> > > > To investigate, look for where the pbuf is allocated (should be in
> > > > tcp_enqueue() I think), and see what value is given for the first
> > > > argument "pbuf_layer layer".  It is this that should control the
> > > > additional space allocated for lower layer headers.
> > > >
> > > > Kieran
> > > >
> > > >
> > > >
> > > > _______________________________________________
> > > > lwip-users mailing list
> > > > address@hidden
> > > > http://lists.nongnu.org/mailman/listinfo/lwip-users
> > > >
> > > >     
> > >
> > > Thanks
> > >
> > > I will look into the allocation in tcp_enqueue() and also get the CVS
> > > version for comparison.
> > >
> > >
> > >
> > > _______________________________________________
> > > lwip-users mailing list
> > > address@hidden
> > > http://lists.nongnu.org/mailman/listinfo/lwip-users
> > >
> > >
> > >   
> > I finally figured out the probem. The ethernetif driver i am using is 
> > designed for an earlier version of lwip and it seems that lwip 
> > changed the argument order in etharp_output() in version 1.3.0 so 
> > instead of putting the header in the pbuffer, lwip tried to put it in 
> > ipaddr. So it was a quick fix after i figured it out.
> >
> >
> > Now i have run into a problem with a mailbox in lwip or a queue in 
> > FreeRTOS.
> > I have a printf in netcom accept just after the creation of the 
> > newconn pointer and after the sys_arch_mbox_fetch and they prints:
> > "newconn 0x2af6"
> > and
> > "mbox fetch: 0x10013540 conn: 0x2af6 recmbox: 0xf01f0046"
> > In accept_function i have a printf just before the data is added to 
> > the mailbox and looks like this:
> > "mailbox: 0x10013540 conn 0x10002600 recvmbox: 0x100136b0"
> > Why isn't the data properly sent through the mailbox or queue?

Nevermind. I found the problem.
When a new mailbox is created i had changed the size from sizeof( void * 
)  to a dynamic size. This is not a good idea when queues in FreeRTOS 
use void pointers.